How do I resolve an error that caused the cancellation of my blog?

I tried to integrate the service PagSeguro on my blog. I think I did something wrong, because my blog not this opening. I put it back on the air, how do I solve this problem? I'm learning to work with internet.
Thank you!
Blog url: http://rebecawestin.wordpress.com/

I tried to integrate the service PagSeguro on my blog. I think I did something wrong, because my blog not this opening. I put it back on the air, how do I solve this problem? I'm learning to work with internet.
Thank you!

You cannot integrate PagSeguro into a free hosted WordPress.com blog. E-commerce transactions via shopping carts and the like cannot be conducted on free blogs from and being free hosted by WordPress.com
If you do require an ecommerce site, advertising, etc. you can hire a web host and get a free software install from http://wordpress.org Refer to > http://support.wordpress.com/com-vs-org/